/Engine/Plugins/Experimental/TextToSpeech/Source/TextToSpeech/Public/TextToSpeechEngineSubsystem.h
Returns the current volume strings are vocalized on a text to speech channel. Value is between 0.0f and 1.0f. If the provided channel Id doesn't exist, 0.0f will be returned.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=TextToSpeech) float GetVolumeOnChannel ( [FName](API\Runtime\Core\UObject\FName) InChannelId )